... just once, and suddenly it was a text message. You'll never get back to iMessag

1. Check whether there is any problem with your settings and whether iMessage is turned on. If there is no problem, let's see if it is a short message for everyone. This is a two-way service. Let's see what others say.

2. Go to "Settings" and click "General" and "Date and Time". In the date and time settings, make sure that "Automatic Settings" is turned on, then turn on the iMessage option and click "Open" to activate again.

3. First of all, if you are both iphone phones and both phones are networked, when you send a short message, the send button on the right side of the input box will automatically turn blue, which corresponds to the green sending of ordinary short messages. At this time, sending imessage has the same function as ordinary SMS, but it does not consume SMS fees.